Emerson Process Management 2051 manual Rosemount, Reference Manual, 00809-0200-4101,Rev AA July

Rosemount 2051

Reference Manual

00809-0200-4101, Rev AA July 2008

Situation #3

The transmitter in situation #3 is installed below the tank in a position where the liquid column in the impulse line, with an empty tank, is equivalent to 2.0 psi (see Figure 3-2).

Figure 3-2. Situation #3

Diagram.

16 ft

Empty Tank

0 ft

2.0 psi measured at the transmitter

Table 3-4. Analog Input function block configuration for a pressure transmitter used in level measurement (Situation #3).

Solution to situation #3

Table 3-4 lists the appropriate configuration settings.

Parameter	Configured Values
L_TYPE	Indirect
XD_SCALE	2 to 9 psi
OUT_SCALE	0 to 16 ft
Channel	1 - pressure

In this example, when the PV is 4 psi, OUT will be calculated as follows:

OUT = 4 psi – 2 psi * (16 ft. – 0 ft.) + 0 ft. = 4.57 ft. 9 psi – 2 psi

Differential pressure transmitter to measure flow

Situation #4

The liquid flow in a line is to be measured using the differential pressure across an orifice plate in the line. Based on the orifice specification sheet, the differential pressure transmitter was calibrated for 0 to 20 inH20 for a flow of 0 to 800 gal/min.

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